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PA165: Service Tier II.
Spring framework
Petr Adámek

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Content: Spring Framework
•Introduction into Spring
•Spring IoC
–XML driven
–Annotation driven
–Code driven
•AOP
•Transaction Management
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INTRODUCTION INTO SPRING
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Spring framework
•http://projects.spring.io/spring-framework/
•Rod Johnson: Expert One-on-One J2EE Design and Development (2002)
•Non-invasive framework, very flexible, does not try to reinvent the wheel
•Current version 3.2.4
•Very good documentation
(http://docs.spring.io/spring/docs/3.2.4.RELEASE/spring-framework-reference/html/)
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SPRING IOC
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XML Application Context
•Configured by XML
•Different modules (different namespaces)
•Benefits
–Pure declarative approach
–Allows to change system configuration without changing code (very useful for customizations)
•Weaknesses
–Not transparent
–Lots of configuration is needed
–Hard to maintain
–Problem with refactoring
•Example (property initialization, constructor initialization)
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Annotation driven
•Configured by annotations
•Benefits
–Less configuration needed
–More clear and transparent
–No problem with refaktoring
•Weaknesses
–Less flexibility
•Can be combined with xml configuration (<context:annotation-config />, <context:component-scan />)
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Annotation driven
•Proprietary
–@Component, @Service, @Repository
–@Autowired, @Required
•JSR-330:
–@Named
–@Inject, @Qualifier
•Other
–@Resource, @PersistenceContext, @PersistenceUnit
•Example
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Code driven
•Benefits
–Almost any code could be evaluated during initialization
–No problem with refactoring
•Weaknesses
–Pure imperative approach
–Configuration is hardcoded into the class
•@Configuration, @Bean
•@ComponentScan, @PropertySource, @Import
•Each @Bean method is evaluated just once!
•Example
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SPRING AOP
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AOP
•http://docs.spring.io/spring/docs/3.2.4.RELEASE/spring-framework-reference/html/aop.html
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TRANSACTION MANAGEMENT
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Transactions Management
•PlatformTransactionManager
–DataSourceTransactionManager
–JtaTransactionManager
–JpaTransactionManager
–HibernateTransactionManager
•Declarative approach (controlled with AOP, @Transactional)
•Imperative approach (API of PlatformTransactionManager)
•<tx:annotation-driven/>
•@EnableTransactionManagement
•Integration with JPA
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Questions
•?
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